question_answer 47)

  Low visibility during cold weather is due to (a) formation of fossil fuel (b) un burnt carbon particles or hydrocarbons suspended in air (c) lack of adequate power supply (d) None of the above

Answer:

  (b) The combustion of fossil fuels increases the amount of suspended particles in air. These suspended particles could be be burnt carbon particles (i.e., hydrocarbons). Presence of high levels of these pollutant cause visibility to be lowered, especially in cold weather when water also condenses out of air. This is known as smog and it is a visible indication of air pollution.